change default ontolgy from FOAF to internal ontlogy .owl

[dalilous]

Hello

After several tries, i finally managed to Install webVOWL on openshift :). my first app in openshift
i would like to be able to change the default ontology to an internal onotlogy that i created wit protége,
could someone explain me how to proceed?
i can't find anything in the documentation

Thank you in advance for your help